| 摘要 |
A method for selecting a transfer procedure for DTMF signal tones in heterogeneous networks is disclosed. The method includes the steps of: (a) notifying of the transfer procedure that can be used for the signal tones, whereby the signal tones are supported by a first transfer exchange located between a packet network and a circuit network, from the first transfer exchange over a signalling network to a second transfer exchange between the packet network and the circuit network, (b) the second transfer exchange selects a transfer procedure for DTMF signal tones which is supported both by the first transfer exchange and the second transfer exchange, and (c) notifying the first transfer exchange of the transfer procedure that is selected by the second transfer exchange.
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